Creating a list of files in a directory

[Jeff Klassen]

Thanks to Alex at the 'HelpDesk', this solves it

>The match method of RE's returns None when there is no match. So, just
guard the append statement with a test: if matchedfile is not None:

for allfiles in workingdir:
    matchedfile=filespec.search(allfiles)
    if matchedfile > 0:
        filestoprocess.append(matchedfile.group())

"Jeff Klassen" <nospam!jklassen at biblesociety.ca> wrote in message
news:FpeG7.3375$pR5.112872545 at radon.golden.net...
> Hello,
>
> I am new to Python. As a non-programmer I am encouraged by the level of
> 'success' I feel I have had, relative to similar learning attempts in
other
> languages.
>
> I would like to simply do the following:
> - read all of files of a particular form (e.g. *.cev) from a particular
> directory
> - manipulate them with a series of re.sub expressions
> - write each file to its own output file with a certain form (e.g. *.out).
>
> I have been able to create the re stuff, and process individual files.
> However, I cannot get a for loop to do everything in a directory.
>
> Here is the code I came up with. (I am wanting to create a list of all
files
> that conform to *.cev)
>
> ----------------------------
> import dircache
> import re
>
> workingdir=dircache.listdir('/jobs/python/learning/')
> filespec = re.compile(r'.*?\.cev')
> filestoprocess = []
>
> for allfiles in workingdir:
>     matchedfile=filespec.match(allfiles)
>     filestoprocess.append(matchedfile.group())
>
> print filestoprocess
> ----------------------------
>
> When I run this script I am returned:
> AttributeError: 'None' object has no attribute 'group'
>
> When I issue these commands in the Python Shell, substituting an actual
> value for allfiles such as 'mat.cev', everything works OK. I can execute
> filestoprocess.append(matchedfile.group()) and then print filestoprocess,
> and I am returned ['mat.cev']. Why does this fail to work inside of the
> loop?
>
> Thanks very much for any help.
>
> Jeff
>
>